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    unified plugin to infer file metadata from Git of a document.


    What is this?

    This package is a unified plugin to infer when content was first published, last modified, and who contributed to it, from Git.

    unified is a project that transforms content with abstract syntax trees (ASTs). vfile is the virtual file interface used in unified. This is a unified plugin that extracts metadata from Git and exposes it on the vfile.

    When should I use this?

    This plugin is particularly useful in combination with rehype-meta. When both are used together, output such as the following is generated:

    <meta name="copyright" content="© 2019 Jane">
    <meta name="author" content="Jane">
    <!-- … -->
    <meta property="article:published_time" content="2019-12-02T10:00:00.000Z">
    <meta property="article:modified_time" content="2019-12-03T19:13:00.000Z">


    This package is ESM only. In Node.js (version 12.20+, 14.14+, 16.0+, or 18.0+), install with npm:

    npm install unified-infer-git-meta

    In Deno with

    import unifiedInferGitMeta from ''

    In browsers with

    <script type="module">
      import unifiedInferGitMeta from ''


    Say our module example.js looks as follows:

    import {read} from 'to-vfile'
    import {unified} from 'unified'
    import remarkParse from 'remark-parse'
    import unifiedInferGitMeta from 'unified-infer-git-meta'
    import remarkRehype from 'remark-rehype'
    import rehypeDocument from 'rehype-document'
    import rehypeMeta from 'rehype-meta'
    import rehypeFormat from 'rehype-format'
    import rehypeStringify from 'rehype-stringify'
    const file = await unified()
      .use(rehypeMeta, {
        // Published and modified are only added if these two are also defined:
        og: true,
        type: 'article'
      .process(await read(''))

    …now running node example.js yields:

      meta: {
        published: new Date('2021-09-09T11:12:34.000Z'),
        modified: new Date('2021-09-09T11:23:45.000Z'),
        author: 'Titus Wormer'
    <!doctype html>
    <html lang="en">
        <meta charset="utf-8">
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <meta name="author" content="Titus Wormer">
        <meta property="og:type" content="article">
        <meta property="article:published_time" content="2021-09-09T11:12:34.000Z">
        <meta property="article:modified_time" content="2021-09-09T11:23:45.000Z">


    This package exports no identifiers. The default export is unifiedInferGitMeta.

    unified().use(unifiedInferGitMeta, options?)

    Infer some metadata from a document tracked with Git. Infer some meta from Git.

    This plugin sets to the date a file was first committed, to the date a file was last committed, and to an abbreviated list of top authors of the file.


    Configuration (optional).


    Locale(s) to use to join authors and sort their names (string or Array<string>, default: 'en').


    Maximum number of authors to include (number, default: 3). Set to -1 to not limit authors.


    Text to use to label more authors when abbreviating (string, default: 'others').


    Alternative format function to use ((authors: Array<string>) => string). Is given a list of abbreviated author names. If the list of authors had to be abbreviated, the last author is instead replaced by authorRest. Set limit: -1 to receive all author names.


    This package is fully typed with TypeScript. The additional types Format and Options are exported.

    It also registers the fields with vfile. If you’re working with the file, make sure to import this plugin somewhere in your types, as that registers the new fields on the file.

     * @typedef {import('unified-infer-git-meta')}
    import {VFile} from 'vfile'
    const file = new VFile()
    console.log( //=> TS now knows that this is a `Date?`.


    Projects maintained by the unified collective are compatible with all maintained versions of Node.js. As of now, that is Node.js 12.20+, 14.14+, 16.0+, and 18.0+. Our projects sometimes work with older versions, but this is not guaranteed.



    See in unifiedjs/.github for ways to get started. See for ways to get help.

    This project has a code of conduct. By interacting with this repository, organization, or community you agree to abide by its terms.


    MIT © Titus Wormer


    npm i unified-infer-git-meta

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